I'm a professional HVAC engineer and was thrilled at the features and price point upon installing a 3M-50 in my home this past winter.
Entering my first summer with the 3M-50, I'm quite frustrated. Nearly everyone in the HVAC industry will agree, most residential HVAC installations can not maintain proper humidity due to chronic over-sizing of cooling equipment. Yet the Radio T-stat line of stats apparently include a "feature" that exacerbates this problem, having the evaporator fan run a full minute after the compressor shuts off, re-evaporating moisture into the air!
Even in my situation, my residential unit is right-sized, and last summer my home's humidity was typically maintained at 45-55%, most often between 45-50%. Enter the 3M-50 t-stat to my system.
Imagine my dismay upon learning this t-stat runs 1-minute fan cycle after cooling terminates, immediately increasing humidity in my home. As a result, my system now has trouble keeping humidity below 55-60%.
In the name of all things good for residential cooling and humidity control, Radio T-stat Company of America, I beg you to disable this "feature" in the next firmware release, or at least provide a means of disabling it. Nearly all residential systems can enable this "feature" anyhow, if so desired by an ignorant homeowner, via dipswitch settings on the controller board or $10 relay wired into the system.
Please please please make this right!!! Otherwise, I am in love with your products, but this problem may be the reason I am forced to return it.